Ch3_AsphaltT PP - CH. 3 - Asphalt Introduction History 6000...

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Unformatted text preview: CH. 3 - Asphalt Introduction History 6000 BC Natural asphalt Cementing and waterproofing LaBrea tar pits in LA Rock asphalt Today Petroleum Industry 70% paving 20% roofing 10% waterproofing Bituminous Materials Mixtures of hydrocarbons derived from petroleum Asphalt A dark brown to black petroleum residue from refining crude oil. Soluble in hydrocarbon solvents. Tar A black byproduct from the production of coke. Coal tars roofing, adhesives and Asphalt Production Asphalt Production Asphalt cements fractional distillation Asphalt - heating Liquid asphalt - solvents Asphalt Cutbacks RC rapid curing - eg. Gasoline MC medium curing eg. kerosine SC slow curing - eg. petroleum oil based solvent Asphalt Emulsions emulsifying agent Oil-in-water emulsion Anionic limestone aggregates Medium Curing Cutbacks When cutback asphalts are used as a prime coat, the cutback asphalt is sprayed to the surface of untreated sub grade or base layers in order to fill the surface voids and protect the subbase from water penetration; stabilize the fines and preserve the subbase material and/or promote bonding to the subsequent pavement layers Rapid Curing Cutbacks When used as a tack coat, the cutback asphalt is applied between hot mix asphalt pavement lifts to promote adequate...
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Ch3_AsphaltT PP - CH. 3 - Asphalt Introduction History 6000...

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